@misc{indiciaef07866c6a7ac,
  title = {Map of northwestern Hillsborough County, Florida, showing the piezometric surface, November 21-23, 1957},
  author = {Walter S. Wetterhall},
  year = {1957},
  doi = {10.3133/ofr57122},
  url = {https://pubs.usgs.gov/publication/ofr57122},
  note = {Source identifier: ofr57122}
}